Stator assembly and fuel injector using same

A fuel injector, comprising:

• an injector body defining a nozzle outlet, a cooling inlet and a drain outlet;
• a solenoid assembly, being disposed inside the injector body, and including a stator assembly;
• the stator assembly including at least one pole piece;
• the at least one pole piece defines a cooling passage extending therethrough;
• a cooling path includes the cooling passage and extends between the cooling inlet and the drain outlet;
• wherein the at least one pole piece includes an inner pole piece;
• the cooling passage defined by the at least one pole piece being an inner pole cooling passage being defined by the inner pole piece;
• wherein the at least one pole piece further includes an outer pole;
• the outer pole of the stator assembly includes a cooling surface;
• the injector body including an inner wall surface;
• an outer pole cooling passage being defined between the cooling surface and the inner wall surface of the injector body;
• the cooling path further includes the outer pole cooling passage.

A fuel injector, comprising:

• an injector body including a flux carrying portion and defining a nozzle outlet;
• a single pole solenoid assembly, being disposed inside the injector body, and including a stator assembly, an armature, a flux ring component and the flux carrying portion of the injector body;
• the armature having a top armature surface and a side armature surface;
• the stator assembly having a bottom stator surface and including an inner pole and an outer pole;
• a flux gap being defined between the outer pole of the stator assembly and the flux carrying portion of the injector body;
• an initial axial air gap being defined between the top armature surface of the armature and the bottom stator surface of the stator assembly when the armature is at a de-energized armature position;
• a sliding air gap being defined between the side armature surface and the flux ring component of the solenoid assembly;
• the flux gap and the sliding air gap being smaller than the initial axial air gap.